Найдите значение выражения ab^3 при a=-12 и b=1/4; a=-10 и b=-1.

\[ab^{3}\text{\ \ \ \ }\]

\[a = - 12;\ \ b = \frac{1}{4}:\]

\[- 12 \cdot \left( \frac{1}{4} \right)^{3} = - 12 \cdot \frac{1}{4^{3}} =\]

\[= - \frac{12}{64} = - \frac{3}{16}.\]

\[a = - 10;\ \ \ b = - 1:\ \ \ \ \]

\[- 10 \cdot ( - 1)^{3} = - 10 \cdot ( - 1) = 10.\]